wiswall



(No Model.)

H. STEWART 8v W. B. WISWALL. y

SPRING HAMMER POR BLAGKSMITHS.

No. 385,018. Patented June 26, 1888.

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WW1/maw@ 4HENRY STEVART AND WELLINGTON B. WISWALL, OF LONGMONT,COLORADO.

SPRlNG-HAIVIIVIER FOR BLCKSIVIITHS.

SPECIFICATION forming part of Letters Patent No. 385,018, dated J'une2G, 1888.

Application filed April 30, 1888.

To @ZZ whom it may concern.-

Be it known that we, HENRY STEWART and WELLINGTON B. WrswALL, lofLongmont, county of Boulder, and State of Colorado, have invented a newand useful Spring-Hammer for Blacksmiths, and we do hereby declare thatthe following is such a full, clear, and exact description of theinvention as will enable any person skilled in the art to which itbelongs to make and use the same, reference being had to theaccompanying drawings, forming part of this specification.

Our invention relates to spring-hammers or power-hammers forblacksmiths, and has for its object the production of a device that willgreatly lessen the amount of physical exertion necessary to operate it;and it consists in combinations and devices that will be hereinafterfully specified.

Referring to the accompanying drawings, Figure l is a side view. Fig. 2is a rear end view. Fig. 3 is a top or plan view.

The saine letters of reference refer to the same or corresponding parts.

G is a block or base supporting the anvil F.

M is a `base-piece, preferably a casting, se cured to the floor by meansof lag-screws or by any suitable means. Upon this base is swiveled ablock, M', which is also preferably a metallic casting, Lbeing theswivel-bolt. Into a mortise or slot in the block M sets the foot of thestandard E, upon which are adjustably secured by means of bolts cl d thebearing-pieces DD, which are also preferably metallic castings.Material, however, is not of our invention, as this standard, thebearingblocks, and many other parts may be made of hard wood or anysuitable material. The object of making these bearing-pieces adjustablevertically, as shown in Fig. l, is to adjust their height to that of thework, to anvils of different heights, and so on.

In the bearing-blocks D is pivoted the rod C, to which the hammer-handleB, carrying the hammer-head A, is secured in any well-known manner.Hammer-handle B and the rod C may be welded together, if of malleableiron, or they may be cast in one piece; or, if wooden, they may beunited in any way common to a skilled workman.

The object of swiveling the standard E and Serial No. 272,251. (Nomodel.)

at one end, while its other end is furnished with a short bend or arm;or it may be furnished with abutton or knob-like head, which fits intothe aperture or slot K in the block K. This block K is firmly bolted tothe anvilblock G. An arm, H', extends from thelever H to the lever J, towhich it is pivoted, the lever J being itself pivoted to the block K; orit would answer, ifproperly shaped, to be pivoted to the swivelblock.The lever J is at its lower end furnished with several holes, as seen inFig. 2. The motion of the upper end of said lever J will throw thestandard E, and hence the hammer, from one position to another, and theturning of the standard will be greater or less, according as the arm His pivoted in one or another hole in the lever J.`

It is our intention to adapt our device to be used with anvils alreadyin use in workshops, and as these differ materially in size it isnecessary to adapt the amount of swing of the hammer from side to sideto the size of different anvils. This lever J may be furnished with atooth to take into a rack fastened on the anvilblock; but we find thatthe friction between the lever H and the walls of the slot K is sufcientto retain the lever wherever it may be set.

O is the operating-lever. As shown, it is to be operated by the foot ofthe blacksmith,who holds the work upon which he is operating. Connectingthe rear or projecting end of the hammerhandle with the hook N, which ispreferably secured to the part M, is the spiral or coil spring I', andthe spiral spring I connects as a pitman the hammer-.handle and thefoot-lever O. Ve have shown these as coilsprings. Of course they mightbe iiat or leaf springs, as any spring in these two places would bewithin our invention; butwe find spiral or coil springs to answer ourpurpose best. Hitherto a spring has been used as we use the spring l tothrow up a hammer after it has been thrown down by means of a pitman-rodICO or chain; but we are not aware that prior to our invention any onehas ever used aspringptman, and herein resides the great power of ourhammer. lVhen once the hammer has been thrown down to give ablow, therecoil of the spring I, assisted by the retractile energy of the springI' whichhas just been expanded by the descent of the hammer, starts theham-- mer quickly upward again. This upward motion ofthe hammer extendsfully the spring` l, and permits the other spring, l', to contract toits normal or even beyond its normal condition by reason of itselasticity and the mo inentum imparted to it, and hence their unitedforce again throws the hammer down, striking a blow whose momentumexceeds anything that we have Yever known by any other than ourinvention. After the first two or three strokes of the hammer a man can,without4 lifting hs foot from the floor, but by simply working his toesup and down as his heel rests on the door, strike a tremendous blow, thesprings by their rebound keeping the hammer in activity.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent of the Unit-ed States, is-

1. The combination of the support, the hammer, the operating-lever forthe hammer, the spring to throw up the hammer after the blow has beenstruck, and the spring-pitman, all substantially as deseribed,and forthe purposes set forth.

2. The combination of the hammer, the support therefor, its severalconnections with the floor, and means for adjusting the support so thatthe hammer may be thrown to strike on fuller or face of the anvil atwill, as described.

3. The block M, the block M', swiveled therein, the standard or supportE, secured in the block M' and carrying the hammer, the levers H and J,the block K K', and the footlever O, all in combination, substantiallyas described.

4. The combination of the standard E, earrying the hammer, thebase-blocks M M', in

which the standard is swiveled, the adjusting-Y lever I-I J, and theblock K K', with the footlever O and the springs I I', all substantiallyas described, and for the purposes set forth.

5. The combination ofahammer, an adjustable support for the hammer, sothat the hammer may be swung to deliver its blow at different points ina horizontal plane, a springpitman to operate said hammer, and arecoilspring to throw up the ham mer aftereach blow is given,substantially'as described, and for the purposes set forth.

' In testimony that we claim the foregoing we have hereunto set ourhands, this 23d day of April, A. D. 1888, in the presence of twowitnesses.

Witnesses:

FRANK L. SMITH, B. L. CARR.

